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    <title>Document</title>
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<body>
    <h1>sdfasdfasdfasdf</h1>
    <!-- <img src="https://cdn.sstatic.net/Img/home/illo-hero-full.svg?v=e2018a5f9272" alt=""> -->
    <h1>123123</h1>
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            // alert('网页加载成功');
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    <select>
        <option value="a">1111</option>
        <option value="b">2</option>
        <option value="c">3333</option>
    </select>
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        var select = document.querySelector('select');
        console.log(
            select.options // 获取下拉列表的所有列表项
        );
        console.log(select.value);
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